State any five features of modern periodic table.

Find the pair of elements having similar properties by applying Newlands’ law of Octaves (Example: $\mathrm{Mg} \& \mathrm{Ca}$): 

Set I: $\mathrm{F}, \mathrm{Mg}, \mathrm{C}, \mathrm{O}, \mathrm{B}$

Set II: $\mathrm{Al}, \mathrm{Si}, \mathrm{S}, \mathrm{Cl}, \mathrm{Ca}$

State whether true or false. If false, correct the statement.

Newlands’ periodic table is based on atomic masses of elements and modern periodic table is based on atomic number of elements.

State whether true or false. If false, correct the statement.

Metals can gain electrons.

State whether true or false. If false, correct the statement.

Alloys bear the characteristics of both metals and non-metals.

State whether true or false. If false, correct the statement.

Lanthanides and actinides are kept at the bottom of the periodic table because they resemble each other, but they do not resemble with any other group elements.